By eating more peanut butter during their high school years, girls could be improving their breast health in adulthood, according to a US study published recently in the journal Breast Cancer Research and Treatment.

Dr. Graham Colditz, of Washington University School of Medicine in St. Louis, and colleagues found that girls aged 9 to 15 who ate peanut butter and nuts twice a week were 39% less likely to develop benign breast disease by the age of 30 than girls who did not.